Boat Maintenance Tips

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How to fit a typical dinghy sheave box into a spar

By Mark Harper 11th January 2023

This a short article on how to cut a neat slot in your alloy mast or boom to fit a typical sheave box. This example is fitting a small 15mm diameter sheave block (from Ronstan) into a boom for the adjustment of the outboard end of a mainsail flattener. Tools required: Pencil. Masking tape. Ruler. Vernier Callipers. (Optional) Hand/Electric drill and bits. A center punch. A small metal file. (Flat or triangular). A 'Dremel' tool and cutting disc attachment. (Optional) Self tapping screws or pop rivets to fix the sheave box. Duralac Anti Corrosive Compound. A typical Sheave box ...